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Speaker 1: Today on our 20018 GMC Sierra 2500, we're going to be taking a look at the SMI Air Force One supplemental braking system for motor homes with air brakes, part number SM9943. The Air Force One is going to be a proportional braking system and it's going to take the air pressure from your motor home's air brakes and apply it to the towed vehicle's brakes. So it's going to match up… see more >
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